Spirirer Trxanus, Meek. 
Fig. 9. Dorsal view of a small example. 
Coal measures. Missouri. 
SpirirerR Loeant, Hall. 
Fig. 10. A dorsal view of the original specimen; showing the great size and 
general external characters of the species. 
Keokuk limestone. Near Nauvoo, Iilinois. 
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